JPH04371374A - Cutter for chip dresser and this manufacture - Google Patents

Abstract

PURPOSE:To manufacture a cutter for chip dresser, in which number of processes of machinings, such as boring, cutting, is reduced and of which the structure is simple and the strength is high. CONSTITUTION:In the cutter for chip dresser, recessed spherical zone faces 1a, 1a' are arranged as facing upper and lower faces of the cutter body 1 and at least one of vertical hole 2 penetrating the recessed spherical zone face 1a and the recessed spherical zone face 1a' and further, inclined faces 3, 3 as the recessed curving face in the vertical hole 2 are arranged at the recessed spherical zone face 1a side and the recessed spherical zone 1a' side, respectively and boundary part between the above recessed spherical zone face 1a and the vertical hole 2 and boundary part between the recessed spherical zone face 1a' and the vertical hole 2, are made to edge parts 4, 4, respectively.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter for a tip dresser that cuts and shapes the tip of an electrode tip, and a method for manufacturing the same.

0002

2. Description of the Related Art Conventional cutters for chip dressers include those manufactured by combining blades and holding them in a cylindrical holder, or by performing processing such as drilling or cutting on the cutter body. In the case where the blades are combined and held in a cylindrical holder, for example, as shown in FIG. The side ends of two blades 12, 13 combined in a cross shape are fitted into the fitting grooves 11, 11. Blade 12, 1
3 are the upper and lower ends 12a, 12b, 13a, and 13b, respectively.
are recessed in a parabolic shape, and their edges serve as blade portions 14, and furthermore, the blade 12 has notches 15, 15 formed at the center of the lower edge 12b, and the blade 13 at the center of the upper edge 13a, respectively. , these notches 15, 15 are fitted together to form a cross-shaped cutter blade, so that the electrode tip can be cut from above and below.

[0003] For cutter bodies that have been subjected to processing such as drilling or cutting, for example, as shown in FIGS. 15 to 17,
The upper and lower surfaces of the cutter body 1 are respectively concave spherical surfaces 1a and 1.
a', and hollow out four perfect circular holes 16 arranged radially from the center of the cutter body 1 from the concave spherical zone surface 1a toward the concave spherical zone surface 1a', and cut these perfect circular holes 16... An extended portion 16a is provided near the center of the main body 1, and a concave spherical zone surface 1a and a concave spherical zone surface 1a' are provided on the concave spherical zone surface 1a side and the concave spherical zone surface 1a' side of these perfect circular holes 16.
An inclined surface 17 is provided near the radius of the concave spherical zone surface 1 between the enlarged portions 16a, 16a of the adjacent perfect circular holes 16, 16.
Inclined surfaces 18 are provided on the a side and the concave spherical zone surface 1a' side, respectively.
, and the boundary between the concave spherical zone surface 1a and the inclined surfaces 17..., 18... and the boundary between the concave spherical zone surface 1a' and the inclined surfaces 17..., 18... are assumed to be blade parts 19, 19, respectively. The structure is such that the electrode tip can be cut from the ground.

0004

[Problems to be Solved by the Invention] However, in order to manufacture the above-mentioned conventional cutter for a chip dresser, in which the blades are combined and held in a cylindrical holder, the number of processing steps for the blades themselves is large. Moreover, extra processes such as assembly processes are required, and if the cutter body is subjected to processing such as drilling or cutting, the number of processing steps is large and the structure is complex, making it difficult to manufacture products with high precision at low cost. The problem was that it could not be done. In addition, a cutter in which the blades are combined and held in a cylindrical holder has a problem in that it is inferior in strength to a cutter in which the cutter body is subjected to processing such as drilling or cutting.

[0005] Therefore, the present invention was made for the purpose of manufacturing a cutter for a tip dresser that has a simple structure and excellent strength by reducing the number of processing steps such as drilling and cutting on the cutter body. It is.

[0006]

[Means for Solving the Problems] A cutter for a chip dresser according to the present invention has concave spherical zone surfaces 1a and 1a' facing each other on the upper and lower surfaces of a cutter body 1, and has concave spherical zone surfaces 1a and 1a' facing each other.
At least one vertical hole 2 passing through the concave spherical surface 1a' is provided, and the vertical hole 2 is provided with inclined surfaces 3, 3 which are concave curved surfaces.
are provided on the concave spherical zone surface 1a side and the concave spherical zone surface 1a' side, respectively, and the boundary between the concave spherical zone surface 1a and the vertical hole 2, and the boundary between the concave spherical zone surface 1a' and the vertical hole 2 are provided with a blade part 4, respectively. It is assumed to be 4.

The method for manufacturing a cutter for a chip dresser according to the present invention includes the steps of processing the upper and lower surfaces of the cutter body 1 into concave spherical zone surfaces 1a and 1a', respectively;
a step of forming at least one vertical hole 2 passing through the concave spherical zone surface 1a', the concave spherical zone surface 1a and the concave spherical zone surface 1a
' From the outer periphery of the vertical hole 2 toward each of the vertical holes 3
, 3.

[0008]

[Operation] In the cutter for a chip dresser according to the present invention, the blade portion 4 provided on the cutter body 1 can be easily processed with fewer steps. In the method for manufacturing a cutter for a chip dresser according to the present invention, the concave spherical zone surface 1
a, 1a', the vertical hole 2, and the inclined surfaces 3, 3 can be easily machined using an end mill or the like.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutter for a chip dresser and a method of manufacturing the same according to the present invention will be explained below with reference to the drawings shown as embodiments. 1 to 12 show each embodiment of a cutter for a chip dresser according to the present invention.

In the figure, reference numeral 1 denotes a cutter body having a holding flange on the side circumference of a cylinder, and a concave spherical surface 1a on the upper and lower surfaces.
, 1a' are provided facing each other, and a vertical hole 2 is provided that passes through the concave spherical zone surface 1a and the concave spherical zone surface 1a'. Surfaces 3 and 3 are provided on the concave spherical zone surface 1a side and the concave spherical zone surface 1a' side, respectively, and the boundary between the concave spherical zone surface 1a and the vertical hole 2 and the boundary between the concave spherical zone surface 1a' and the vertical hole 2 are respectively The blade portions 4, 4 are provided.

The vertical holes 2 shown in FIGS. 1 to 3 are two oblong holes arranged vertically and parallel to each other with the center of the cutter body 1 in between. Since this device does not have a blade 4 in the center of the cutter body 1, the center of the electrode of the tip cannot be cut, but the pickup remaining in the center moves the tip to the center of the cutter body 1. It is pushed out and removed by the pressure applied to the part. Furthermore, in the case of the vertical hole 2 shown in FIGS. 4 to 6, the vertical hole 2 shown in FIGS.
It is assumed that it is moved to one side of the . Since this tool has a blade section 4 in the center of the cutter body 1, it is possible to cut the entire surface of the electrode of the tip.

Furthermore, the vertical holes 2 shown in FIGS. 7 to 9 are four oblong holes arranged radially from the center of the cutter body 1. This cutter body 1 does not have a blade portion 4 in the center, similar to the cutter body 1 shown in FIGS. 1 to 3. In addition, the vertical hole 2 is as shown in FIG.
12, a pair of opposing vertical holes 2 shown in FIGS. 7 to 9 are moved to one side of the cutter body 1 so as to overlap one of the other pair of opposing vertical holes 2. This cutter has a blade portion 4 at the center of the cutter body 1, similar to those shown in FIGS. 4 to 6.

[0013] The vertical holes 2 are not limited in shape or number, and may have various shapes other than those in the embodiments.
The number can be any number. Next, a method of manufacturing the cutter for a chip dresser according to the present invention shown in FIGS. 1 to 12 will be described. The method for manufacturing a cutter for a chip dresser according to the present invention includes the step of processing the upper and lower surfaces of the cutter body 1 into concave spherical zone surfaces 1a and 1a', respectively, and penetrating the concave spherical zone surface 1a and the concave spherical zone surface 1a'. Process of machining vertical hole 2, concave spherical zone surface 1a and concave spherical zone surface 1a'
an inclined surface 3 toward each of the vertical holes 2 from the outer periphery of the vertical hole 2;
It consists of the process of processing 3.

In order to process the upper and lower surfaces of the cutter body 1 into concave spherical surfaces 1a and 1a', the cutter body 1 is
Machining is done by applying an end mill to the top and bottom surfaces of each. In order to form the vertical hole 2 that passes through the concave spherical zone surface 1a and the concave spherical zone surface 1a', an end mill is applied from the concave spherical zone surface 1a and is passed through the concave spherical zone surface 1a'. If the hole is circular, it can also be drilled. The concave spherical surface 1a and the concave spherical surface 1a'
an inclined surface 3 toward each of the vertical holes 2 from the outer periphery of the vertical hole 2;
3, the concave spherical zone surface 1a and the concave spherical zone surface 1
An end mill is applied to the outer periphery of each hole a' to reach the vertical hole 2.

The cutter for a chip dresser according to the present invention constructed as described above is attached to the tip of the gear case 6 provided in the swinging device 5, as shown in FIG. ) is driven to rotate. Then, the blade portion 4 on the upper and lower surfaces of the cutter body 1,
By pressing a pair of electrode tips 7 onto the electrode 4 from above and below, the tips can be cut and shaped.

[0016]

[Effects of the Invention] In the cutter for a chip dresser according to the present invention, the blade portion 4 provided on the cutter body 1 can be processed easily and with fewer steps, so it is inexpensive, has high precision, and has excellent strength. Become something. and,
In the method for manufacturing a cutter for a chip dresser according to the present invention, the concave spherical surfaces 1a, 1a', the vertical hole 2, and the inclined surfaces 3, 3 can be easily machined with an end mill or the like, so the manufacturing method is inexpensive and highly accurate. Moreover, a cutter for a chip dresser with excellent strength can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a cutter for a chip dresser according to the present invention.

FIG. 2 is a plan view of the chip dresser cutter shown in FIG. 1;

FIG. 3 is a cross-sectional view of the tip dresser cutter taken along line AA in FIG. 2;

FIG. 4 is a perspective view showing another embodiment of the chip dresser cutter according to the present invention.

5 is a plan view of the chip dresser cutter shown in FIG. 4. FIG.

6 is a sectional view taken along line BB in FIG. 5. FIG.

FIG. 7 is a perspective view showing another embodiment of the chip dresser cutter according to the present invention.

8 is a plan view of the chip dresser cutter shown in FIG. 7. FIG.

9 is a sectional view taken along line CC in FIG. 8. FIG.

FIG. 10 is a perspective view showing another embodiment of the chip dresser cutter according to the present invention.

11 is a plan view of the chip dresser cutter shown in FIG. 10. FIG.

12 is a sectional view taken along line DD in FIG. 11. FIG.

FIG. 13 is an explanatory view showing how the cutter for a chip dresser according to the present invention is used.

FIG. 14 is an exploded perspective view of a conventional cutter for a chip dresser.

FIG. 15 is a perspective view of a conventional cutter for a chip dresser.

16 is a plan view of the conventional chip dresser cutter shown in FIG. 15. FIG.

FIG. 17 is a sectional view taken along line E-E in FIG. 16.

[Explanation of symbols]

1 Cutter body 1a Concave spherical zone surface 1a' concave spherical surface 2 Vertical hole ３　　　　　　　　　　Slope 4 Blade part

Claims (2)

[Claims] 1. Concave spherical zone surfaces 1a and 1a' are provided on the upper and lower surfaces of the cutter body 1 to face each other, and at least one vertical hole 2 is provided that passes through the concave spherical zone surface 1a and the concave spherical zone surface 1a', Further, in the vertical hole 2, sloped surfaces 3, 3, which are concave curved surfaces, are provided on the concave spherical zone surface 1a side and the concave spherical zone surface 1a' side, respectively. 1
A cutter for a chip dresser, characterized in that the boundary between a' and the vertical hole 2 are blade parts 4, 4, respectively. 2. A step of processing the upper and lower surfaces of the cutter body 1 into concave spherical zone surfaces 1a and 1a', respectively, a concave spherical zone surface 1a.
a step of forming at least one vertical hole 2 passing through the concave spherical zone surface 1a', the concave spherical zone surface 1a and the concave spherical zone surface 1a
' From the outer periphery of the vertical hole 2 toward each of the vertical holes 3
A method for manufacturing a cutter for a chip dresser, characterized by comprising the steps of processing , 3.